Blkdestheight – Cirrus Logic EP93xx User Manual
Page 292
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DS785UM1
Copyright 2007 Cirrus Logic
Graphics Accelerator
EP93xx User’s Guide
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For Line Draw functions, the method to determine the
value of WIDTH is dependent on the line draw algorithm.
For the Burnishing algorithm, please refer to
BLKDESTWIDTH in
. For the
DX/DY algorithm, please refer to BLKDESTWIDTH in
. The value of WIDTH is
multiplied by the value of HEIGHT in the
register to determine the number of
line draw iterations.
BLKDESTHEIGHT
Address:
0x8004_001C - Read/Write
Default:
0x0000_0000
Mask:
0x0000_07FF
Definition:
Block Function Destination Height Register
Bit Descriptions:
RSVD:
Reserved - Unknown during read
HEIGHT:
Height - Read/Write
For Block Fill or Block Copy functions, the value in this
field specifies the height in ‘lines minus 1’ of the
destination image. Since there is no BLKSRCHEIGHT
register, the source image must have the same height as
the destination image.
For Line Draw functions, the value in this field specifies the
distance in ‘lines minus 1’ between Y_dest_end and
Y_dest_start. The method to determine the value of
HEIGHT is dependent on the line draw algorithm. For the
Breshenham algorithm, please refer to BLKDESTHEIGHT
in
.
The value of HEIGHT is
multiplied by the value of WIDTH in the
register to determine the number of line draw iterations.
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RSVD
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RSVD
HEIGHT